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<title>module Process::GID - RDoc Documentation</title>


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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-change_privilege">::change_privilege</a>
    <li ><a href="#method-c-eid">::eid</a>
    <li ><a href="#method-c-from_name">::from_name</a>
    <li ><a href="#method-c-grant_privilege">::grant_privilege</a>
    <li ><a href="#method-c-re_exchange">::re_exchange</a>
    <li ><a href="#method-c-re_exchangeable-3F">::re_exchangeable?</a>
    <li ><a href="#method-c-rid">::rid</a>
    <li ><a href="#method-c-sid_available-3F">::sid_available?</a>
    <li ><a href="#method-c-switch">::switch</a>
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    <main role="main" aria-labelledby="module-Process::GID">
    <h1 id="module-Process::GID" class="module">
      module Process::GID
    </h1>

    <section class="description">
    
<p>The <a href="GID.html"><code>Process::GID</code></a> module contains a collection of module functions which can be used to portably get, set, and switch the current process’s real, effective, and saved group IDs.</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-change_privilege" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.change_privilege(group)   &rarr; integer
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Change the current process’s real and effective group ID to that specified by <em>group</em>. Returns the new group ID. Not available on all platforms.</p>

<pre class="ruby">[<span class="ruby-constant">Process</span>.<span class="ruby-identifier">gid</span>, <span class="ruby-constant">Process</span>.<span class="ruby-identifier">egid</span>]          <span class="ruby-comment">#=&gt; [0, 0]</span>
<span class="ruby-constant">Process</span><span class="ruby-operator">::</span><span class="ruby-constant">GID</span>.<span class="ruby-identifier">change_privilege</span>(<span class="ruby-value">33</span>)    <span class="ruby-comment">#=&gt; 33</span>
[<span class="ruby-constant">Process</span>.<span class="ruby-identifier">gid</span>, <span class="ruby-constant">Process</span>.<span class="ruby-identifier">egid</span>]          <span class="ruby-comment">#=&gt; [33, 33]</span>
</pre>

                              <div class="method-source-code" id="change_privilege-source">
            <pre>static VALUE
p_gid_change_privilege(VALUE obj, VALUE id)
{
    rb_gid_t gid;

    check_gid_switch();

    gid = OBJ2GID(id);

    if (geteuid() == 0) { /* root-user */
#if defined(HAVE_SETRESGID)
        if (setresgid(gid, gid, gid) &lt; 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined HAVE_SETGID
        if (setgid(gid) &lt; 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) &amp;&amp; !defined(OBSOLETE_SETREGID)
        if (getgid() == gid) {
            if (SAVED_GROUP_ID == gid) {
                if (setregid(-1, gid) &lt; 0) rb_sys_fail(0);
            }
            else {
                if (gid == 0) { /* (r,e,s) == (root, y, x) */
                    if (setregid(-1, SAVED_GROUP_ID) &lt; 0) rb_sys_fail(0);
                    if (setregid(SAVED_GROUP_ID, 0) &lt; 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0; /* (r,e,s) == (x, root, root) */
                    if (setregid(gid, gid) &lt; 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
                else { /* (r,e,s) == (z, y, x) */
                    if (setregid(0, 0) &lt; 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setregid(gid, gid) &lt; 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
            }
        }
        else {
            if (setregid(gid, gid) &lt; 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
#elif defined(HAVE_SETRGID) &amp;&amp; defined (HAVE_SETEGID)
        if (getgid() == gid) {
            if (SAVED_GROUP_ID == gid) {
                if (setegid(gid) &lt; 0) rb_sys_fail(0);
            }
            else {
                if (gid == 0) {
                    if (setegid(gid) &lt; 0) rb_sys_fail(0);
                    if (setrgid(SAVED_GROUP_ID) &lt; 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setrgid(0) &lt; 0) rb_sys_fail(0);
                }
                else {
                    if (setrgid(0) &lt; 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setegid(gid) &lt; 0) rb_sys_fail(0);
                    if (setrgid(gid) &lt; 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
            }
        }
        else {
            if (setegid(gid) &lt; 0) rb_sys_fail(0);
            if (setrgid(gid) &lt; 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
#else
        rb_notimplement();
#endif
    }
    else { /* unprivileged user */
#if defined(HAVE_SETRESGID)
        if (setresgid((getgid() == gid)? (rb_gid_t)-1: gid,
                      (getegid() == gid)? (rb_gid_t)-1: gid,
                      (SAVED_GROUP_ID == gid)? (rb_gid_t)-1: gid) &lt; 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) &amp;&amp; !defined(OBSOLETE_SETREGID)
        if (SAVED_GROUP_ID == gid) {
            if (setregid((getgid() == gid)? (rb_uid_t)-1: gid,
                         (getegid() == gid)? (rb_uid_t)-1: gid) &lt; 0)
                rb_sys_fail(0);
        }
        else if (getgid() != gid) {
            if (setregid(gid, (getegid() == gid)? (rb_uid_t)-1: gid) &lt; 0)
                rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
        else if (/* getgid() == gid &amp;&amp; */ getegid() != gid) {
            if (setregid(getegid(), gid) &lt; 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setregid(gid, -1) &lt; 0) rb_sys_fail(0);
        }
        else { /* getgid() == gid &amp;&amp; getegid() == gid */
            if (setregid(-1, SAVED_GROUP_ID) &lt; 0) rb_sys_fail(0);
            if (setregid(SAVED_GROUP_ID, gid) &lt; 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setregid(gid, -1) &lt; 0) rb_sys_fail(0);
        }
#elif defined(HAVE_SETRGID) &amp;&amp; defined(HAVE_SETEGID)
        if (SAVED_GROUP_ID == gid) {
            if (getegid() != gid &amp;&amp; setegid(gid) &lt; 0) rb_sys_fail(0);
            if (getgid() != gid &amp;&amp; setrgid(gid) &lt; 0) rb_sys_fail(0);
        }
        else if (/* SAVED_GROUP_ID != gid &amp;&amp; */ getegid() == gid) {
            if (getgid() != gid) {
                if (setrgid(gid) &lt; 0) rb_sys_fail(0);
                SAVED_GROUP_ID = gid;
            }
            else {
                if (setrgid(SAVED_GROUP_ID) &lt; 0) rb_sys_fail(0);
                SAVED_GROUP_ID = gid;
                if (setrgid(gid) &lt; 0) rb_sys_fail(0);
            }
        }
        else if (/* getegid() != gid &amp;&amp; */ getgid() == gid) {
            if (setegid(gid) &lt; 0) rb_sys_fail(0);
            if (setrgid(SAVED_GROUP_ID) &lt; 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setrgid(gid) &lt; 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_44BSD_SETGID
        if (getgid() == gid) {
            /* (r,e,s)==(gid,?,?) ==&gt; (gid,gid,gid) */
            if (setgid(gid) &lt; 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_SETEGID
        if (getgid() == gid &amp;&amp; SAVED_GROUP_ID == gid) {
            if (setegid(gid) &lt; 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_SETGID
        if (getgid() == gid &amp;&amp; SAVED_GROUP_ID == gid) {
            if (setgid(gid) &lt; 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#else
        (void)gid;
        rb_notimplement();
#endif
    }
    return id;
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-eid" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          egid        &rarr; integer
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.eid    &rarr; integer
                              </span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::Sys.geteid &rarr; integer
                              </span>
                            </div>

                            <div class="method-description">
                              <p>Returns the effective group ID for the current process:</p>

<pre class="ruby"><span class="ruby-constant">Process</span>.<span class="ruby-identifier">egid</span> <span class="ruby-comment"># =&gt; 500</span>
</pre>

<p>Not available on all platforms.</p>

                              <div class="method-source-code" id="eid-source">
            <pre>static VALUE
proc_getegid(VALUE obj)
{
    rb_gid_t egid = getegid();

    return GIDT2NUM(egid);
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-from_name" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.from_name(name)   &rarr; gid
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Get the group ID by the <em>name</em>. If the group is not found, <code>ArgumentError</code> will be raised.</p>

<pre class="ruby"><span class="ruby-constant">Process</span><span class="ruby-operator">::</span><span class="ruby-constant">GID</span>.<span class="ruby-identifier">from_name</span>(<span class="ruby-string">&quot;wheel&quot;</span>) <span class="ruby-comment">#=&gt; 0</span>
<span class="ruby-constant">Process</span><span class="ruby-operator">::</span><span class="ruby-constant">GID</span>.<span class="ruby-identifier">from_name</span>(<span class="ruby-string">&quot;nosuchgroup&quot;</span>) <span class="ruby-comment">#=&gt; can&#39;t find group for nosuchgroup (ArgumentError)</span>
</pre>

                              <div class="method-source-code" id="from_name-source">
            <pre>static VALUE
p_gid_from_name(VALUE self, VALUE id)
{
    return GIDT2NUM(OBJ2GID(id));
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-grant_privilege" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.grant_privilege(group)    &rarr; integer
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.eid = group               &rarr; integer
                              </span>
                            </div>

                            <div class="method-description">
                              <p>Set the effective group ID, and if possible, the saved group ID of the process to the given <em>group</em>. Returns the new effective group ID. Not available on all platforms.</p>

<pre class="ruby">[<span class="ruby-constant">Process</span>.<span class="ruby-identifier">gid</span>, <span class="ruby-constant">Process</span>.<span class="ruby-identifier">egid</span>]          <span class="ruby-comment">#=&gt; [0, 0]</span>
<span class="ruby-constant">Process</span><span class="ruby-operator">::</span><span class="ruby-constant">GID</span>.<span class="ruby-identifier">grant_privilege</span>(<span class="ruby-value">31</span>)     <span class="ruby-comment">#=&gt; 33</span>
[<span class="ruby-constant">Process</span>.<span class="ruby-identifier">gid</span>, <span class="ruby-constant">Process</span>.<span class="ruby-identifier">egid</span>]          <span class="ruby-comment">#=&gt; [0, 33]</span>
</pre>

                              <div class="method-source-code" id="grant_privilege-source">
            <pre>static VALUE
p_gid_grant_privilege(VALUE obj, VALUE id)
{
    rb_setegid_core(OBJ2GID(id));
    return id;
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-re_exchange" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.re_exchange   &rarr; integer
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Exchange real and effective group IDs and return the new effective group ID. Not available on all platforms.</p>

<pre class="ruby">[<span class="ruby-constant">Process</span>.<span class="ruby-identifier">gid</span>, <span class="ruby-constant">Process</span>.<span class="ruby-identifier">egid</span>]   <span class="ruby-comment">#=&gt; [0, 33]</span>
<span class="ruby-constant">Process</span><span class="ruby-operator">::</span><span class="ruby-constant">GID</span>.<span class="ruby-identifier">re_exchange</span>      <span class="ruby-comment">#=&gt; 0</span>
[<span class="ruby-constant">Process</span>.<span class="ruby-identifier">gid</span>, <span class="ruby-constant">Process</span>.<span class="ruby-identifier">egid</span>]   <span class="ruby-comment">#=&gt; [33, 0]</span>
</pre>

                              <div class="method-source-code" id="re_exchange-source">
            <pre>static VALUE
p_gid_exchange(VALUE obj)
{
    rb_gid_t gid;
#if defined(HAVE_SETRESGID) || (defined(HAVE_SETREGID) &amp;&amp; !defined(OBSOLETE_SETREGID))
    rb_gid_t egid;
#endif

    check_gid_switch();

    gid = getgid();
#if defined(HAVE_SETRESGID) || (defined(HAVE_SETREGID) &amp;&amp; !defined(OBSOLETE_SETREGID))
    egid = getegid();
#endif

#if defined(HAVE_SETRESGID)
    if (setresgid(egid, gid, gid) &lt; 0) rb_sys_fail(0);
    SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) &amp;&amp; !defined(OBSOLETE_SETREGID)
    if (setregid(egid,gid) &lt; 0) rb_sys_fail(0);
    SAVED_GROUP_ID = gid;
#else
    rb_notimplement();
#endif
    return GIDT2NUM(gid);
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-re_exchangeable-3F" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.re_exchangeable?   &rarr; true or false
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Returns <code>true</code> if the real and effective group IDs of a process may be exchanged on the current platform.</p>

                              <div class="method-source-code" id="re_exchangeable-3F-source">
            <pre>static VALUE
p_gid_exchangeable(VALUE _)
{
#if defined(HAVE_SETRESGID)
    return Qtrue;
#elif defined(HAVE_SETREGID) &amp;&amp; !defined(OBSOLETE_SETREGID)
    return Qtrue;
#else
    return Qfalse;
#endif
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-rid" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          gid         &rarr; integer
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.rid    &rarr; integer
                              </span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::Sys.getgid &rarr; integer
                              </span>
                            </div>

                            <div class="method-description">
                              <p>Returns the (real) group ID for the current process:</p>

<pre class="ruby"><span class="ruby-constant">Process</span>.<span class="ruby-identifier">gid</span> <span class="ruby-comment"># =&gt; 1000</span>
</pre>

                              <div class="method-source-code" id="rid-source">
            <pre>static VALUE
proc_getgid(VALUE obj)
{
    rb_gid_t gid = getgid();
    return GIDT2NUM(gid);
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-sid_available-3F" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.sid_available?   &rarr; true or false
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Returns <code>true</code> if the current platform has saved group ID functionality.</p>

                              <div class="method-source-code" id="sid_available-3F-source">
            <pre>static VALUE
p_gid_have_saved_id(VALUE _)
{
#if defined(HAVE_SETRESGID) || defined(HAVE_SETEGID) || defined(_POSIX_SAVED_IDS)
    return Qtrue;
#else
    return Qfalse;
#endif
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-switch" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.switch              &rarr; integer
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          Process::GID.switch {|| block}   &rarr; object
                              </span>
                            </div>

                            <div class="method-description">
                              <p>Switch the effective and real group IDs of the current process. If a <em>block</em> is given, the group IDs will be switched back after the block is executed. Returns the new effective group ID if called without a block, and the return value of the block if one is given.</p>

                              <div class="method-source-code" id="switch-source">
            <pre>static VALUE
p_gid_switch(VALUE obj)
{
    rb_gid_t gid, egid;

    check_gid_switch();

    gid = getgid();
    egid = getegid();

    if (gid != egid) {
        proc_setegid(obj, GIDT2NUM(gid));
        if (rb_block_given_p()) {
            under_gid_switch = 1;
            return rb_ensure(rb_yield, Qnil, p_gid_sw_ensure, SAVED_GROUP_ID);
        }
        else {
            return GIDT2NUM(egid);
        }
    }
    else if (egid != SAVED_GROUP_ID) {
        proc_setegid(obj, GIDT2NUM(SAVED_GROUP_ID));
        if (rb_block_given_p()) {
            under_gid_switch = 1;
            return rb_ensure(rb_yield, Qnil, p_gid_sw_ensure, egid);
        }
        else {
            return GIDT2NUM(gid);
        }
    }
    else {
        rb_syserr_fail(EPERM, 0);
    }

    UNREACHABLE_RETURN(Qnil);
}</pre>
                              </div>
                            </div>


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